advice on storage controller

[caplam]

Hello,

i'd like to have some advice on storage controller.

Here is my situation. I have an HP Z620 with 6 sata HDD on 3 GB/s ports.

I also have 2 M2 sata ssd on pcie bracket on 2 6 GB/s ports (the only ones of the motherboard).

I have a LSI 9207-8e hba (P20 firmware) 

 sas2flash -list
LSI Corporation SAS2 Flash Utility
Version 20.00.00.00 (2014.09.18) 
Copyright (c) 2008-2014 LSI Corporation. All rights reserved 

        Adapter Selected is a LSI SAS: SAS2308_2(D1) 

        Controller Number              : 0
        Controller                     : SAS2308_2(D1) 
        PCI Address                    : 00:03:00:00
        SAS Address                    : 500605b-0-098c-fb80
        NVDATA Version (Default)       : 14.01.00.06
        NVDATA Version (Persistent)    : 14.01.00.06
        Firmware Product ID            : 0x2214 (IT)
        Firmware Version               : 20.00.07.00
        NVDATA Vendor                  : LSI
        NVDATA Product ID              : SAS9207-8e
        BIOS Version                   : 07.39.02.00
        UEFI BSD Version               : 07.27.01.01
        FCODE Version                  : N/A
        Board Name                     : SAS9207-8e
        Board Assembly                 : H3-25427-02H
        Board Tracer Number            : SV43732784

        Finished Processing Commands Successfully.
        Exiting SAS2Flash.

Hooked to the lsi i have a jbod das with 12G ability (no expander)

 

The 2 m2 sata ssds are quite dead due to what is probably a bug between docker btrfs driver, btrfs pool and unraid (it still has to be processed). So i need urgently to change the ssds. For now i use a one drive cache formatted in xfs on one of the 2 m2 ssd.

I have 2 samsung 860 evo sata which are in good shape (20TB written).

I have no room inside the HP for the sata ssds.

I don't absolutely need 12G link for my jbod.

I'd like to have a cache pool but for now it's not really an option as btrfs is mandatory.

From what i've read lsi 9207 (and all lsi sas2) does not support trim with samsung ssd (and other ?) with P20 firmware.

Can i downgrade lsi 9207 to P16 firmware which seems to be compatible with trim ? How can i do that from within unraid or bios ?

What hba would be compatible with unraid and trim ? preferably sas3 if i have to change.

I'm also looking for a strong ssd and i'm waiting for an answer on a good deal on a 970 pro 1TB.

If i go for a sas3 controller i could use sas ssd with great endurance.